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I just got bitten by this particular problem, on a heavily used disk =
image. I'm trying to defragment the disk images. Hop this will help.
Le 8 juin 2017 =C3=A0 07:19, Markus Stockhausen =
<stockhausen(a)collogia.de> a =C3=A9crit :
=20
Hi Fernando,=20
=20
we personally like XFS very much. But XFS + qcow2 (even for snapshots =
in OVirt)
comes close to a no-go these days. We are experience excessive =
fragmentation.
For more info see unresolved Redhat Info:
=20
https://access.redhat.com/solutions/532663 =
<
https://access.redhat.com/solutions/532663>
=20
Even with tuning the XFS allocation policy on the qcow2 directory with=20=
=20
xfs_io -c 'extsize -R 2M' <qcow2-dir>
=20
A nice 3rd party explanation can be found here:
=20
=
https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocation-dead=
lock-kmem_alloc/ =
<
https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocation-dea=
dlock-kmem_alloc/>
=20
Markus
=20
Von: users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org> =
[users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org>]" im Auftrag =
von "FERNANDO FREDIANI [fernando.frediani(a)upx.com =
<mailto:fernando.frediani@upx.com>]
Gesendet: Mittwoch, 7. Juni 2017 23:35
An: users(a)ovirt.org <mailto:users@ovirt.org>
Betreff: [ovirt-users] Performance differences between ext4 and XFS
=20
Just wanted to find out what filesystem people are using to host =
Virtual Machines
in qcow2 files in a filesystem in Localstorage, ext4 or =
XFS ?
=20
I normally like XFS for big files which is the case fo VMs, but =
wondered if
anyone could see any performance advantage when compared =
with ext4.
=20
Fernando
=
<InterScan_Disclaimer.txt>_______________________________________________
Users mailing list
Users(a)ovirt.org <mailto:Users@ovirt.org>
http://lists.ovirt.org/mailman/listinfo/users =
<
http://lists.ovirt.org/mailman/listinfo/users>
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<html><head><meta http-equiv=3D"Content-Type"
content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">I just got bitten by this particular problem, on a heavily =
used disk image. I'm trying to defragment the disk images. Hop this will =
help.<div class=3D""><br class=3D""></div><div
class=3D""><br =
class=3D""><div><blockquote type=3D"cite"
class=3D""><div class=3D"">Le =
8 juin 2017 =C3=A0 07:19, Markus Stockhausen <<a =
href=3D"mailto:stockhausen@collogia.de" =
class=3D"">stockhausen(a)collogia.de</a>&gt; a =C3=A9crit
:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div
=
style=3D"font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; orphans: auto; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; widows: =
auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255); direction: ltr; font-family: =
Arial; font-size: 10pt;" class=3D""><div
class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div
class=3D""><div class=3D""><div =
class=3D""><div style=3D"font-family: Tahoma; font-size: 13px;"
=
class=3D"">Hi Fernando,<span =
class=3D"Apple-converted-space"> </span></div><div =
style=3D"font-family: Tahoma; font-size: 13px;" class=3D""><br
=
class=3D""></div><div style=3D"font-family: Tahoma; font-size:
13px;" =
class=3D"">we personally like XFS very much. But XFS + qcow2 (even for =
snapshots in OVirt)</div><div style=3D"font-family: Tahoma; font-size: =
13px;" class=3D"">comes close to a no-go these days. We are experience
=
excessive fragmentation.</div><div style=3D"font-family: Tahoma; =
font-size: 13px;" class=3D"">For more info see unresolved Redhat =
Info:</div><div class=3D""><font face=3D"Tahoma"
class=3D""><span =
style=3D"font-size: 13px;" class=3D""><br =
class=3D""></span></font></div><div
class=3D""><font face=3D"Tahoma" =
class=3D""><span style=3D"font-size: 13px;"
class=3D""><a =
href=3D"https://access.redhat.com/solutions/532663" =
class=3D"">https://access.redhat.com/solutions/532663</a&...
iv><div style=3D"font-family: Tahoma; font-size: 13px;"
class=3D""><br =
class=3D""></div><div style=3D"font-family: Tahoma; font-size:
13px;" =
class=3D"">Even with tuning the XFS allocation policy on the qcow2 =
directory with </div><div style=3D"font-family: Tahoma; font-size:
=
13px;" class=3D""><br class=3D""></div><div
class=3D""><font =
face=3D"Tahoma" class=3D""><span style=3D"font-size:
13px;" =
class=3D"">xfs_io -c 'extsize -R 2M' =
<qcow2-dir></span></font></div><div
style=3D"font-family: Tahoma; =
font-size: 13px;" class=3D""><br
class=3D""></div><div =
style=3D"font-family: Tahoma; font-size: 13px;" class=3D"">A nice
3rd =
party explanation can be found here:</div><div style=3D"font-family: =
Tahoma; font-size: 13px;" class=3D""><br
class=3D""></div><div =
class=3D""><font face=3D"Tahoma"
class=3D""><span style=3D"font-size: =
13px;" class=3D""><a =
href=3D"https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allocat=
ion-deadlock-kmem_alloc/" =
class=3D"">https://blog.codecentric.de/en/2017/04/xfs-possible-memory-allo=
cation-deadlock-kmem_alloc/</a></span></font></div><div =
style=3D"font-family: Tahoma; font-size: 13px;" class=3D""><br
=
class=3D""></div><div style=3D"font-family: Tahoma; font-size:
13px;" =
class=3D"">Markus</div><div style=3D"font-family: Tahoma;
font-size: =
13px;" class=3D""><br =
class=3D""></div></div></div></div></div></div></div></div><div
=
style=3D"font-family: 'Times New Roman'; font-size: 16px;"
class=3D""><hr =
tabindex=3D"-1" class=3D""><div id=3D"divRpF447039"
style=3D"direction: =
ltr;" class=3D""><font face=3D"Tahoma" size=3D"2"
class=3D""><b =
class=3D"">Von:</b><span
class=3D"Apple-converted-space"> </span><a =
href=3D"mailto:users-bounces@ovirt.org" =
class=3D"">users-bounces(a)ovirt.org</a><span =
class=3D"Apple-converted-space"> </span>[<a =
href=3D"mailto:users-bounces@ovirt.org" =
class=3D"">users-bounces(a)ovirt.org</a>]" im Auftrag von
"FERNANDO =
FREDIANI [<a href=3D"mailto:fernando.frediani@upx.com" =
class=3D"">fernando.frediani(a)upx.com</a>]<br
class=3D""><b =
class=3D"">Gesendet:</b><span =
class=3D"Apple-converted-space"> </span>Mittwoch, 7. Juni 2017
=
23:35<br class=3D""><b class=3D"">An:</b><span =
class=3D"Apple-converted-space"> </span><a =
href=3D"mailto:users@ovirt.org"
class=3D"">users(a)ovirt.org</a><br =
class=3D""><b class=3D"">Betreff:</b><span =
class=3D"Apple-converted-space"> </span>[ovirt-users]
Performance =
differences between ext4 and XFS<br class=3D""></font><br =
class=3D""></div><div class=3D""></div><div
class=3D""><font =
face=3D"arial, helvetica, sans-serif" class=3D"">Just wanted to
find out =
what filesystem people are using to host<span =
class=3D"Apple-converted-space"> </span></font>Virtual
Machines in =
qcow2 files in a filesystem in Localstorage, ext4 or XFS ?<br =
class=3D""><br class=3D"">I normally like XFS for big files
which is the =
case fo VMs, but wondered if anyone could see any performance advantage =
when compared with ext4.<br class=3D""><br
class=3D"">Fernando<br =
class=3D""></div></div></div><span =
id=3D"cid:0583B5F5-532F-462E-A18F-E203C8395CED@dsone.3ds.com"><InterSca=
n_Disclaimer.txt></span><span style=3D"font-family: Helvetica; =
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widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
background-color: rgb(255, 255, 255); float: none; display: inline =
!important;" =
class=3D"">_______________________________________________</span><br
=
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
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